======================================= Orbital Elements of 78P/Gehrels in 2200 ======================================= To reproduce these results with JPL Horizons: 1. Go to the Horizons website at http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=78P and select 78P [2006] as Target Body. 2. Set Ephemeris Type to Orbital Elements. 3. Set Center to @sun for sun-centered (heliocentric). 4. Set Time Span as 2200-01-01 to 2200-01-02. Output generated by Kevin Heider on 05-10-2009. ******************************************************************************* JPL/HORIZONS 78P/Gehrels 2 2009-May-10 17:12:21 Rec #:900754 Soln.date: 2006-Mar-09_13:54:18 # obs: 2066 (1989-2006) FK5/J2000.0 helio. ecliptic osc. elements (AU, DAYS, DEG, period=Julian yrs): EPOCH= 2453803.5 != 2006-Mar-09.0000000 (CT) Residual RMS= .62231 EC= .462250363298529 QR= 2.008721591619866 TP= 2453305.485872597 OM= 210.5444312789764 W= 192.9668264619907 IN= 6.253034444979252 A= 3.73542156893171 MA= 67.988632099733 ADIST= 5.462121546243553 PER= 7.2196747941215 N= .136519485 ANGMOM= .029481677 DAN= 5.34496 DDN= 2.02505 L= 43.4366975 B= -1.4004546 TP= 2004-Oct-26.9858726 Physical & non-grav parameters (KM, SEC; A1,A2,A3=AU/d^2; DT=days): GM= n.a. RAD= n.a. A1= 7.414731E-9 A2= -5.806115D-10 A3= -7.201611D-10 DT= n.a. M1= 6.5 M2= n.a. k1= 14. k2= n.a. PHCOF= n.a. COMET comments 1: soln ref.= JPL#K043/41, data arc: 1989-Jun-14 to 2006-Feb-26 2: k1=14.0; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Sun May 10 17:12:22 2009 Pasadena, USA / Horizons ******************************************************************************* Target body name: 78P/Gehrels 2 {source: JPL#K043/41} Center body name: Sun (10) {source: DE405} Center-site name: BODY CENTER ******************************************************************************* Start time : A.D. 2200-Jan-01 00:00:00.0000 CT Stop time : A.D. 2200-Jan-02 00:00:00.0000 CT Step-size : 1440 minutes ******************************************************************************* Center geodetic : .000000000,.000000000,.00000000 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: .000000000,.000000000,.00000000 {E-lon(deg),Dxy(km),Dz(km)} Center radii : 696000.0 x 696000.0 x 696000.0 k{Equator, meridian, pole} System GM : 2.9591220828559093E-04 AU^3/d^2 Small perturbers: Ceres, Pallas, Vesta {source: SB405-CPV-2} Small body GMs : 6.32E+01, 1.43E+01, 1.78E+01 km^3/s^2 Output units : AU-D, deg, Julian day number (Tp) Output format : 10 Reference frame : ICRF/J2000.0 Output type : GEOMETRIC osculating elements Coordinate systm: Ecliptic and Mean Equinox of Reference Epoch ******************************************************************************* Initial FK5/J2000.0 heliocentric ecliptic osculating elements (AU, DAYS, DEG): EPOCH= 2453803.5 != 2006-Mar-09.0000000 (CT) Residual RMS= .62231 EC= .462250363298529 QR= 2.008721591619866 TP= 2453305.485872597 OM= 210.5444312789764 W= 192.9668264619907 IN= 6.253034444979252 Comet physical & dynamic parameters (KM, SEC; A1,A2,A3=AU/d^2; DT=days): GM= n.a. RAD= n.a. A1= 7.414731E-9 A2= -5.806115D-10 A3= -7.201611D-10 DT= n.a. M1= 6.5 M2= n.a. k1= 14. k2= n.a. PHCOF= n.a. ******************************************************************************* JDCT EC QR IN OM W Tp N MA TA A AD PR ******************************************************************************* $$SOE 2524593.500000000 = A.D. 2200-Jan-01 00:00:00.0000 (CT) EC= 4.672423780309439E-01 QR= 4.992294275199564E+00 IN= 7.085863906878758E+00 OM= 1.759685026956155E+02 W = 1.711540544532843E+02 Tp= 2523182.731886474881 N = 3.435961710612218E-02 MA= 4.847345220624467E+01 TA= 1.029459793353463E+02 A = 9.370667015045594E+00 AD= 1.374903975489162E+01 PR= 1.047741594116470E+04 2524594.500000000 = A.D. 2200-Jan-02 00:00:00.0000 (CT) EC= 4.672426797187398E-01 QR= 4.992309740310610E+00 IN= 7.085864311960277E+00 OM= 1.759684571065742E+02 W = 1.711544803136260E+02 Tp= 2523182.734709102660 N = 3.435942826270076E-02 MA= 4.850744823635722E+01 TA= 1.029854375744501E+02 A = 9.370701349866021E+00 AD= 1.374909295942143E+01 PR= 1.047747352626358E+04 $$EOE ******************************************************************************* Coordinate system description: Ecliptic and Mean Equinox of Reference Epoch Reference epoch: J2000.0 xy-plane: plane of the Earth's orbit at the reference epoch x-axis : out along ascending node of instantaneous plane of the Earth's orbit and the Earth's mean equator at the reference epoch z-axis : perpendicular to the xy-plane in the directional (+ or -) sense of Earth's north pole at the reference epoch. Symbol meaning [1 AU=149597870.691 km, 1 day=86400.0 s]: JDCT Epoch Julian Date, Coordinate Time EC Eccentricity, e QR Periapsis distance, q (AU) IN Inclination w.r.t xy-plane, i (degrees) OM Longitude of Ascending Node, OMEGA, (degrees) W Argument of Perifocus, w (degrees) Tp Time of periapsis (Julian day number) N Mean motion, n (degrees/day) MA Mean anomaly, M (degrees) TA True anomaly, nu (degrees) A Semi-major axis, a (AU) AD Apoapsis distance (AU) PR Orbital period (day) Geometric states/elements have no aberration corrections applied. Computations by ... Solar System Dynamics Group, Horizons On-Line Ephemeris System 4800 Oak Grove Drive, Jet Propulsion Laboratory Pasadena, CA 91109 USA Information: http://ssd.jpl.nasa.gov/ Connect : telnet://ssd.jpl.nasa.gov:6775 (via browser) telnet ssd.jpl.nasa.gov 6775 (via command-line) Author : Jon.Giorgini@jpl.nasa.gov *******************************************************************************